That "golden sample" from Gainward is nothing but a factory overclocked GTX650ti, that still use the basic stock cooler. Performance should some closer to a 7790, but not enough to be on par with it.
At the same price range I suggest taking a look at 1gb versions of GTX650ti boost. Compared to 2gb version, beside the 1gb vram handicap, the memory clock is a bit lower. The rest is on par with 2gb verion of 650ti BE.
Its just i builded two (Budget) gaming pc-s in two diffrent stores and the first builds the pc for free and shipping is free too while the second one wants money for both. So thanx to the first store i got some spare bucks (15$
) and can buy there the HD7790. While in the Second shop i could only buy te GTX 650 TI "GS".